Although the question seems easy, a candidate is likely to find himself/herself in dilemma regarding option 1. Firstly, the flow of the sentence is very abrupt – it should be smooth. The reader should feel the consistency when he/she reads a sentence. Also, the use of COMMA is not appropriate (‘Titanic, a great MOVIE, was…’ would have been a better phrase). If we look at the other options, this option does not seem to be the best choice.

Among options 2 and 3, we can decide which one is CORRECT if we know how to use the subordinating conjunctions ‘so…that...’and ‘such…that...’ appropriately.

Both are used to show a cause and effect relationship. The only DIFFERENCE lies in their structural pattern:

(A) So+adjective / adverb+that+result

Example : The suitcase is so HEAVY that I cannot lift it.

(B) Such+a+(adjective)+singular noun+that+result

Example : She has such a charming personality that everybody is mesmerized by her speech.

The use of a after so in option 3 is, thus, incorrect.

Option 2 is structurally correct and conveys the desired meaning without any ambiguity.

Therefore, the correct answer is option 2.